murblanc commented on a change in pull request #2179:
URL: https://github.com/apache/lucene-solr/pull/2179#discussion_r553633390



##########
File path: 
solr/core/src/java/org/apache/solr/cloud/api/collections/CreateCollectionCmd.java
##########
@@ -116,6 +121,25 @@ public void call(ClusterState clusterState, ZkNodeProps 
message, @SuppressWarnin
       throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "collection 
alias already exists: " + collectionName);
     }
 
+    String withCollection = message.getStr(WITH_COLLECTION);
+    String withCollectionShard = null;
+    if (withCollection != null) {
+      String realWithCollection = aliases.resolveSimpleAlias(withCollection);

Review comment:
       We should not follow aliases at all and specify that the 
`withCollection` must be an existing real collection name.




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